class_docstr: Single line textbox widget.
docstr: Handle a msg from the front-end.
  
  Parameters
  ----------
  content: dict
      Content of the msg.
docstr_tok: ["Handle","a","msg","from","the","front-end",".","Parameters","--","--","--","--","--","content",":","dict","Content","of","the","msg","."]
code: def _handle_string_msg(self, _, content, buffers):
      """Handle a msg from the front-end.
  
      Parameters
      ----------
      content: dict
          Content of the msg.
      """
      if content.get("event", "") == "submit":
          self._submission_callbacks(self)
  
imports: from .widget_description import DescriptionWidget
  from .valuewidget import ValueWidget
  from .widget import CallbackDispatcher, register
  from .widget_core import CoreWidget
  from .trait_types import TypedTuple
  from traitlets import Unicode, Bool, Int
  from warnings import warn
label_desc: Use image node_id 2 for calling the Text obj's underlying member method code with example usage: obj._handle_string_msg(_, content, buffers) without return types